On Fri, 30 Aug 2002 14:33:13 -0700, David Conrad <david.conrad@nominum.com> said: > On 8/30/02 10:16 AM, "Fred Baker" <fred@cisco.com> wrote: >> - one prefix for each ISP in the world >> - one prefix for each POP or campus in your network >> - one prefix for each LAN in your POP or Campus >> - additional prefixes that you decide to carry for your own reasons (eg, >> policy) > My, that's a lot of prefixes. I'm sure I'm missing something here. Probably - note how the scope gets narrower as you go down to smaller parts of the Internet. In the IPv4 Internet, you have all of the above, plus - many prefixes assigned to most ISPs in the world after they used up their first assignment - many "campus" prefixes around the world that haven't been assigned according to ISP topology (such as legacy Class B/Cs) - many prefixes for "campuses" around the world that changed or added ISPs but kept addresses from their original provider's range. Looks like IPv6 won't have the first two of these. We'll see what will happen to the third category. -- Simon.